linux-kernel - [PATCH RFC v1 1/4] dt-bindings: net: dwmac-meson: use picoseconds for the RGMII RX delay

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Message-Id: <20201114200104.4148283-2-martin.blumenstingl@googlemail.com>
Date:   Sat, 14 Nov 2020 21:01:01 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     davem@...emloft.net, kuba@...nel.org,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org
Cc:     jianxin.pan@...ogic.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, khilman@...libre.com,
        narmstrong@...libre.com, jbrunet@...libre.com, andrew@...n.ch,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH RFC v1 1/4] dt-bindings: net: dwmac-meson: use picoseconds for the RGMII RX delay

Amlogic Meson G12A, G12B and SM1 SoCs have a more advanced RGMII RX
delay register which allows picoseconds precision. Deprecate the old
"amlogic,rx-delay-ns" in favour of a new "amlogic,rgmii-rx-delay-ps"
property.

For older SoCs the only known supported values were 0ns and 2ns. The new
SoCs have 200ps precision and support RGMII RX delays between 0ps and
3000ps.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 .../bindings/net/amlogic,meson-dwmac.yaml     | 52 ++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
index 6b057b117aa0..bafde1194193 100644
--- a/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
+++ b/Documentation/devicetree/bindings/net/amlogic,meson-dwmac.yaml
@@ -74,18 +74,68 @@ allOf:
             Any configuration is ignored when the phy-mode is set to "rmii".
 
         amlogic,rx-delay-ns:
+          deprecated: true
           enum:
             - 0
             - 2
           default: 0
+          description:
+            The internal RGMII RX clock delay in nanoseconds. Deprecated, use
+            amlogic,rgmii-rx-delay-ps instead.
+
+        amlogic,rgmii-rx-delay-ps:
+          default: 0
           description:
             The internal RGMII RX clock delay (provided by this IP block) in
-            nanoseconds. When phy-mode is set to "rgmii" then the RX delay
+            picoseconds. When phy-mode is set to "rgmii" then the RX delay
             should be explicitly configured. When the phy-mode is set to
             either "rgmii-id" or "rgmii-rxid" the RX clock delay is already
             provided by the PHY. Any configuration is ignored when the
             phy-mode is set to "rmii".
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,meson8b-dwmac
+              - amlogic,meson8m2-dwmac
+              - amlogic,meson-gxbb-dwmac
+              - amlogic,meson-axg-dwmac
+    then:
+      properties:
+        amlogic,rgmii-rx-delay-ps:
+          enum:
+            - 0
+            - 2000
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amlogic,meson-g12a-dwmac
+    then:
+      properties:
+        amlogic,rgmii-rx-delay-ps:
+          enum:
+            - 0
+            - 200
+            - 400
+            - 600
+            - 800
+            - 1000
+            - 1200
+            - 1400
+            - 1600
+            - 1800
+            - 2000
+            - 2200
+            - 2400
+            - 2600
+            - 2800
+            - 3000
+
 properties:
   compatible:
     additionalItems: true
-- 
2.29.2